Superheating device in tubular steam-boilers.



"UNITED STATES PATENT Omen.

WILHELM SCHMIDT AND PETER THOMSEN, OF wiLHELMsHoHE, NEAR oAssEL, GERMANY, ASSIGNORS TO SCHMIDT STEAM POWER PAREN 00., LTD., or LONDON, ENGLAND, A FIRM.

SUPERHEATING DEVICE IN TUBULAR STEAM-BOILERS.

SPECIFIGATION forming part ofLetters Patent N 0. 703,482, dated July 1, 1902 Application filed January 26, 1901. Serial No. 44,914. No m deld To all whom, it may concern:

Be it known that we, WILHELM SCHMIDT and PETER THoMsEN, subjects of the King of Prussia, German Emperor, residents of-Wil-' helmshohe, near Oassel, in the Province of Hesse-Nassau, German Empire, have jointly invented certainnew and useful Improvements inSuperheating Devices in Tubular Steam-Boilers, of which the following'is an exact specification.

These improvements relate to superheaters which are arranged in large tubes in tubu lar boilers and offer theefollowing advantages, as compared with previous arrangements,viz

According to this invention theisuperheatee pipes in U form or serpentine form are made with an angular bend at the rear outlet of the boiler-tubes of the locomotive or other boiler, so that the superheater-pipes can terminate in suitable steam-inlet and steam-outlet chain, bers in the smoke-box. The boiler-tube can thus be cleaned without difiiculty by a clean ing-tool or by a steam-jet or in any desired manner. The regulating device can therefore by reason of the aforesaid bending of the superheater-pipes and by reason of the boilertubes being open toward the smoke-box easily be applied andwithout impairing the access to the boiler-tubes.

In order to make our invention more clear, we refer to the accompanying drawings, in which similar. letters denote similar parts throughout the different views,and in which' Figure l is Vertical longitudinal and Fig;

2 a vertical cross section of a supe'rheater applied to a locomotive-boiler. Fig. 3 is an enlarged vertical longitudinal section of the superheat'er. Fig. 4 is a cross-section. Fig. 5 is a vertical longitudinal and Fig. 6 a vertical cross section of another arrangement where the superheater-pipes are bent backward and forward. I

Referring to Figs. 1, 2, and 3, the steam from the steam-dome on the boiler enters the in a large boiler-tubes.

steam-chamber ct and passes by the lower openings 1) into the'ends c c of the pipes c, which are bent and reach into the boilertubes 8 and have bends and return-pipes 0 'the e'ndsc of which are bent upward. The

pipe ends a and c are made tightin the plate 29 by a tube-expander tool, and this plate is fixed to the steam-chamber a and a second steam-chambers, which leads to the cylinder,

. by means of bolts and nuts d.

r is a regulating-damper which when in horizontal position admits ofperfect cleaning of the boiler-tubes.

As shown in Fig. 4, there may be a greater number of boiler-tubes provided with superheater-pipes where 'a large superheatin suh face is required.

InFigs. 5 and 6 the superheating-pipes run backward and. forward in serpentine fashion The superheating-pipes may be bent up- Ward, downward, or sidewise, or in different directions, so long as the enlarged boiler-tube is clear'of the steam-chambers a and z, and thus permits of access.

Itis to be noted. as advantageous that the fixing of the bent pipe ends c and c does not "take place directly in the steam-collectors a .2,

but in a plate p, whereby it becomes possible to remove the whole of the superheater from the boiler-tube 8 Without removing the steamcollectors or .2.

Having thus fully described the nature of our invention, what we desire to secure by Letters Patent of the United States is 1. In locomotive and other steam-boilers,

arranged in the boiler-tubes and'having their ends bent to the steam-collector, a regulating-damper behind'the, bends of the superheating-pipes, substantially as and for the purpose set forth.

3. In locomotive and other steam-boilers,

the combination with a steam-collector of a names to this specification in the presence of snperheater consisting of superheating-pipes two subscribing witnesses. arranged in the boiler-tubes and having their WVILHELM SCHMIDT. [L. 5.] ends bent to the steam-collector, plates which PETER THOMSEN. LL. 8.] are detachably fixed to the chambers and in Witnesses as to Wilhelm Schmidt: which the superheating-pipe bends are fixed, JULIUS FRANKIE, a regulating-damper behind the bends of the WILHELM GERKEWS. superheating-pipe, substantially as described NVitnesses as to Peter Thomsen: and for the purpose set forth. VVILI-I. GRAMPP,

In testimony whereof we have signed our 1 OTTO RGPER. 

